EP0314272A1 - A method of fluid flow visualisation - Google Patents

A method of fluid flow visualisation Download PDF

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Publication number
EP0314272A1
EP0314272A1 EP88306754A EP88306754A EP0314272A1 EP 0314272 A1 EP0314272 A1 EP 0314272A1 EP 88306754 A EP88306754 A EP 88306754A EP 88306754 A EP88306754 A EP 88306754A EP 0314272 A1 EP0314272 A1 EP 0314272A1
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EP
European Patent Office
Prior art keywords
fluid flow
coating
component
based paint
visualisation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP88306754A
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German (de)
French (fr)
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EP0314272B1 (en
Inventor
Hugh Michael Laurence Watson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rolls Royce PLC
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Rolls Royce PLC
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Application filed by Rolls Royce PLC filed Critical Rolls Royce PLC
Publication of EP0314272A1 publication Critical patent/EP0314272A1/en
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Publication of EP0314272B1 publication Critical patent/EP0314272B1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
    • G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
    • G01M9/065—Measuring arrangements specially adapted for aerodynamic testing dealing with flow
    • G01M9/067—Measuring arrangements specially adapted for aerodynamic testing dealing with flow visualisation

Definitions

  • This invention relates to a method for the visualisation of fluid flows over the surfaces of solid components.
  • a component surface is coated with a wet solution of Manganese chloride (Mncl2) and Hydrogen Peroxide (H2O2).
  • Ammonia (NH3) or methylamine is introduced into an airstream and passed over the surface. Due to local diffusion and absorption effects, colourisation reactions occur on the coated surface of the component to give an immediate visual indication of the fluid flow over the component surface by way of the varying colour intensity.
  • the present invention seeks to provide an improved method of fluid flow visualisation over the surfaces of solid components.
  • a method of fluid flow visualisation comprises the steps of coating a component with a pigmented oil based paint of non-geling characteristics, applying dry dye particles which are soluble in the oil based paint to the surface of the coating and passing a fluid flow over the component, whereby the fluid flow causes the dye particles to translate across the coating dissolving to leave trails on the surface of the coating which trails enables visualisation of the passage of the fluid flow over the surface of the component.
  • the pigmented oil based paint comprises a solid solution of a fluorescent pigment in a melamine formaldehyde sulphonamide resin suspended in a mineral oil.
  • the pigmented oil based paint preferably includes a wetting agent such as Linoleic Acid.
  • the dry dye particles applied to the coating of pigmented oil based paint are preferably of a contrasting phthalocyanine dye.
  • a surface 15 of a solid component 17 is coated with a pigmented oil based paint 18 of non-geling characteristics, and with a viscosity chosen such that the paint coating will not move under gravity.
  • the following formulation attains a pigmented oil based paint of non-geling characteristics and with the necessary viscosity: 120 grammes of a solid solution of a fluorescent pigment in a melamine formaldehyde sulphonamide resin mixed with 234 grammes of a mineral oil.
  • the preferred pigment is produced by Sterling Industrial colours Limited and is marketed under the trade name Flare 610 series (Yellow 7).
  • the mineral oil is that marketed under the trade name of Mobil Jet II Oil.
  • a wetting agent such as Linolic Acid is introduced to ensure cohesion of the pigmented oil based paint to the surface 15 of the solid component 17.
  • Particles of a dry phthalocyanine dye 19 are then uniformly sprinkled onto the coating of the oil based paint 18 using a dry brush or an industrial air blower depending on the accessibility of the surfaces under test.
  • a flow of air 20 is then passed over the solid component 17 and this causes the dye particles 19 to translate across the coating of the oil-based paint 18.
  • the dye particles 19 move to new positions, as shown for clarity by the single dye particle at 19a, under the influence of the air flow.
  • the regions of the dye particles that come into contact with the coating of the oil-based paint dissolve in the oil as they are translated to leave a trail 22 on the surface of the coating. This results in a reduction in the size of the particles, as shown at 19a due to their dissolution.
  • a contrasting phthalocyanine dye is sprinkled onto the coating of the oil-based paint so that movement of the particles 19 under the influence of an air flow produces a pattern of contrasting trails on the surface of the coating which permanently records and highlights the fluid flow distribution pattern for visualisation.
  • Comparison of the relative movements of the dye particles 19, provides an indication of the relative strengths of the fluid flows acting on the surfaces of the component under test.
  • the method of flow visualisation described and illustrated herein has the advantage that by utilising a phthalocyanine dye which is soluble in the oil, the subsequent movement of these particles under the influence of a gaseous flow causes trails which highlight and permanently record the gaseous flow distribution pattern for visualisation. Techniques used previously relied on streaks appearing in the actual coating on application of an air flow.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)

Abstract

A method of flow visualisation comprises the steps of coating the surface (15) of a component (17) in a pigmented oil-based paint (18) of non-geling characteristics, applying dry dye particles (19), which are soluble in the oil based paint (18) to the surface of the coating (15) and passing a fluid flow (20) over the component (17).
The fluid flow (20) causes the dye particles (19) to translate across the coating so that regions of the particles that are in contact with the coating dissolve to leave trails (22) on the surface of the coating which are indicative of the relative strengths of the fluid flows acting on the surfaces of the component.

Description

  • This invention relates to a method for the visualisation of fluid flows over the surfaces of solid components.
  • It is known to apply a coating, with non-geling characteristics, to a surface of a component which on the subsequent passage of a fluid flow thereover will move to produce a visible pattern of streaks in the coated surface. The pattern generated in th coating enables visualisation of the fluid flow direction across the component surfaces.
  • In Patent Application DE2659693, a component surface is coated with a wet solution of Manganese chloride (Mncl₂) and Hydrogen Peroxide (H₂O₂). Ammonia (NH₃) or methylamine is introduced into an airstream and passed over the surface. Due to local diffusion and absorption effects, colourisation reactions occur on the coated surface of the component to give an immediate visual indication of the fluid flow over the component surface by way of the varying colour intensity.
  • Disadvantages of this known method of flow visualisation are that:
    • (a) a gas has to be introduced into the airstream at a controlled rate to ensure that its concentration is uniform throughout the air­stream,
    • (b) the introduction of a gas into the airstream may limit the applications of this technique and possibly adversely affect the environment in which the test is to be conducted,
    • (c) the method is indicated by a positive result of colourisation and therefore failure to introduce the ammonia leads to lack of colourisation effects which unless monitored will be interpreted as a lack of fluid flow distribution about certain features.
  • The present invention seeks to provide an improved method of fluid flow visualisation over the surfaces of solid components.
  • According to the present invention a method of fluid flow visualisation comprises the steps of coating a component with a pigmented oil based paint of non-geling characteristics, applying dry dye particles which are soluble in the oil based paint to the surface of the coating and passing a fluid flow over the component, whereby the fluid flow causes the dye particles to translate across the coating dissolving to leave trails on the surface of the coating which trails enables visualisation of the passage of the fluid flow over the surface of the component.
  • Preferably the pigmented oil based paint, comprises a solid solution of a fluorescent pigment in a melamine formaldehyde sulphonamide resin suspended in a mineral oil.
  • The pigmented oil based paint preferably includes a wetting agent such as Linoleic Acid.
  • The dry dye particles applied to the coating of pigmented oil based paint are preferably of a contrasting phthalocyanine dye.
  • The invention will now be described by way of example and with reference to the accompanying drawing.
  • Referring to the drawing a surface 15 of a solid component 17 is coated with a pigmented oil based paint 18 of non-geling characteristics, and with a viscosity chosen such that the paint coating will not move under gravity.
  • The following formulation attains a pigmented oil based paint of non-geling characteristics and with the necessary viscosity: 120 grammes of a solid solution of a fluorescent pigment in a melamine formaldehyde sulphonamide resin mixed with 234 grammes of a mineral oil.
  • The preferred pigment is produced by Sterling Industrial colours Limited and is marketed under the trade name Flare 610 series (Yellow 7).
  • The mineral oil, is that marketed under the trade name of Mobil Jet II Oil.
  • Optionally 10 grammes of a wetting agent such as Linolic Acid is introduced to ensure cohesion of the pigmented oil based paint to the surface 15 of the solid component 17.
  • Particles of a dry phthalocyanine dye 19 are then uniformly sprinkled onto the coating of the oil based paint 18 using a dry brush or an industrial air blower depending on the accessibility of the surfaces under test.
  • A flow of air 20 is then passed over the solid component 17 and this causes the dye particles 19 to translate across the coating of the oil-based paint 18. The dye particles 19 move to new positions, as shown for clarity by the single dye particle at 19a, under the influence of the air flow. The regions of the dye particles that come into contact with the coating of the oil-based paint dissolve in the oil as they are translated to leave a trail 22 on the surface of the coating. This results in a reduction in the size of the particles, as shown at 19a due to their dissolution.
  • Preferably a contrasting phthalocyanine dye is sprinkled onto the coating of the oil-based paint so that movement of the particles 19 under the influence of an air flow produces a pattern of contrasting trails on the surface of the coating which permanently records and highlights the fluid flow distribution pattern for visualisation.
  • Comparison of the relative movements of the dye particles 19, provides an indication of the relative strengths of the fluid flows acting on the surfaces of the component under test.
  • The method of flow visualisation described and illustrated herein has the advantage that by utilising a phthalocyanine dye which is soluble in the oil, the subsequent movement of these particles under the influence of a gaseous flow causes trails which highlight and permanently record the gaseous flow distribution pattern for visualisation. Techniques used previously relied on streaks appearing in the actual coating on application of an air flow.
  • Further advantages are that there is no necessity for the introduction of a gas into the air flow with the effect that this method will not adversely affect the test environment. It thereby removes the necessity for monitoring the gas concentration introduced into the air flow leading to reductions in both time and expenditure during testing.

Claims (5)

1. A method of fluid flow visualisation comprising the steps of coating a surface (15) of a component (17) with a pigmented oil based paint (18) of non-geling characteristic and passing a fluid flow (20) over the surface of the component (17) the method characterised by,
applying dry dye particles (19) which are soluble in the oil based paint (18) to the surface of the coating, whereby the fluid flow (20) passing over the component (17) causes the dye particles (19) to translate across the coating (18), dissolving to leave trails (22) on the surface of this coating which trails (22) enables visualisation of the passage of the fluid (20) over the surface (15) of the component (17),
2. A method of fluid flow visualisation as claimed in claim 1 characterised in that the pigmented oil based paint (18), comprises a solid solution of fluorescent pigment in a melamine formaldehyde sulphonamide resin suspended in a mineral oil.
3. A method of fluid flow visualisation as claimed in claim 1 or claim 2 characterised in that the pigmented oil based paint (18) includes a wetting agent.
4. A method of fluid flow visualisation as claimed in claim 3 characterised in that the wetting agent is Linoleic Acid.
5. A method of fluid flow visualisation as claimed in any preceding claim characterised in that the dye (19) is a contrasting phthalocyanine dye.
EP88306754A 1987-10-07 1988-07-22 A method of fluid flow visualisation Expired - Lifetime EP0314272B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB878723544A GB8723544D0 (en) 1987-10-07 1987-10-07 Fluid flow visualisation
GB8723544 1987-10-07

Publications (2)

Publication Number Publication Date
EP0314272A1 true EP0314272A1 (en) 1989-05-03
EP0314272B1 EP0314272B1 (en) 1990-12-27

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ID=10624927

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EP88306754A Expired - Lifetime EP0314272B1 (en) 1987-10-07 1988-07-22 A method of fluid flow visualisation

Country Status (5)

Country Link
US (1) US4915975A (en)
EP (1) EP0314272B1 (en)
JP (1) JP2685238B2 (en)
DE (1) DE3861455D1 (en)
GB (1) GB8723544D0 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991016612A1 (en) * 1990-04-12 1991-10-31 Tsentralny Aerogidrodinamichesky Institut Imeni N.E.Zhukovskogo Method and device for determining field of presure of continuous fluid medium on the surface of an object
CN102564723A (en) * 2011-12-14 2012-07-11 中国航空工业集团公司沈阳空气动力研究所 Formula of oil for color oil flow test of low-speed wind tunnel
CN106840576A (en) * 2017-03-10 2017-06-13 中国空气动力研究与发展中心高速空气动力研究所 High-speed wind tunnel oil stream test method
CN106908214A (en) * 2017-03-10 2017-06-30 中国空气动力研究与发展中心高速空气动力研究所 The collocation method and experiment finish of high-speed wind tunnel oil stream experiment finish
CN112432755A (en) * 2020-10-23 2021-03-02 中国空气动力研究与发展中心高速空气动力研究所 Wide-speed-range color fluorescent oil flow reagent and viscosity adjusting method thereof

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5070729A (en) * 1990-12-03 1991-12-10 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Multi-colored layers for visualizing aerodynamic flow effects
US5271954A (en) * 1992-07-29 1993-12-21 Avco Corporation Fluid flow visualization system
AT409759B (en) * 2000-10-03 2002-11-25 Martina Kroell Process for surface coloring porous objects e.g. fiber cement plates comprises applying a mixture of petroleum and colored pigment
US20090038407A1 (en) * 2005-03-14 2009-02-12 Federalnoe Gosudarstvennoe Unitarnoe Predprijatie Central Aerohydrodynamic Institute Method of gas or liquid flow visualization on an object surface
CN109282963A (en) * 2018-09-21 2019-01-29 北京理工大学 Multimedium tracing method based on magnetic fluorescent particles
CN114166463B (en) * 2022-02-14 2022-05-03 中国空气动力研究与发展中心高速空气动力研究所 Oil flow map and surface pressure fusion simulation visualization method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3835703A (en) * 1973-05-21 1974-09-17 Us Army Flow visualization using color reversible dyes
DE2659693A1 (en) * 1976-12-31 1978-07-13 Stuttgart Instgemeinschaft Ev Visual recording of (air)flow patterns over solid surfaces - by applying wet manganese chloride soln. contg. hydrogen peroxide, using ammonia etc. in air stream to cause local colour change

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4423626A (en) * 1981-03-27 1984-01-03 Dean Herschede Method of determining wind direction for hunters

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3835703A (en) * 1973-05-21 1974-09-17 Us Army Flow visualization using color reversible dyes
DE2659693A1 (en) * 1976-12-31 1978-07-13 Stuttgart Instgemeinschaft Ev Visual recording of (air)flow patterns over solid surfaces - by applying wet manganese chloride soln. contg. hydrogen peroxide, using ammonia etc. in air stream to cause local colour change

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
EXPERIMENTS IN FLUIDS *
PATENT ABSTRACTS OF JAPAN *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991016612A1 (en) * 1990-04-12 1991-10-31 Tsentralny Aerogidrodinamichesky Institut Imeni N.E.Zhukovskogo Method and device for determining field of presure of continuous fluid medium on the surface of an object
EP0478780A1 (en) * 1990-04-12 1992-04-08 Tsentralny Aerogidrodinamichesky Institut Imeni N.E. Zhukovskogo Method and device for determining field of pressure of continuous fluid medium on the surface of an object
EP0478780A4 (en) * 1990-04-12 1992-09-30 Tsentralny Aerogidrodinamichesky Institut Imeni N.E. Zhukovskogo Method and device for determining field of presure of continuous fluid medium on the surface of an object
CN102564723A (en) * 2011-12-14 2012-07-11 中国航空工业集团公司沈阳空气动力研究所 Formula of oil for color oil flow test of low-speed wind tunnel
CN102564723B (en) * 2011-12-14 2014-08-06 中国航空工业集团公司沈阳空气动力研究所 Formula of oil for color oil flow test of low-speed wind tunnel
CN106840576A (en) * 2017-03-10 2017-06-13 中国空气动力研究与发展中心高速空气动力研究所 High-speed wind tunnel oil stream test method
CN106908214A (en) * 2017-03-10 2017-06-30 中国空气动力研究与发展中心高速空气动力研究所 The collocation method and experiment finish of high-speed wind tunnel oil stream experiment finish
CN106908214B (en) * 2017-03-10 2019-06-21 中国空气动力研究与发展中心高速空气动力研究所 High-speed wind tunnel oil stream tests the configuration method and test finish of finish
CN112432755A (en) * 2020-10-23 2021-03-02 中国空气动力研究与发展中心高速空气动力研究所 Wide-speed-range color fluorescent oil flow reagent and viscosity adjusting method thereof

Also Published As

Publication number Publication date
US4915975A (en) 1990-04-10
JPH0194941A (en) 1989-04-13
GB8723544D0 (en) 1987-11-11
DE3861455D1 (en) 1991-02-07
EP0314272B1 (en) 1990-12-27
JP2685238B2 (en) 1997-12-03

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